trait TraitK<K, J, I, H, G, F, E, D, C, B, A> {
// Required method
fn extend(
self,
k: &mut K,
j: &mut J,
i: &mut I,
h: &mut H,
g: &mut G,
f: &mut F,
e: &mut E,
d: &mut D,
c: &mut C,
b: &mut B,
a: &mut A,
);
}